Process for crosslinking hydrophilic colloids
US3992366A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1974 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Feb 27, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/305
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for crosslinking hydrophilic colloids which contain amino, imino and/or hydroxyl groups is provided. The crosslinking agents correspond to the formula ##SPC1## Wherein A is hydrogen, hydroxyl, halogen, acylamino, an immonium-ether radical, the radical --NR.sub.1 R.sub.2 with R.sub.1 and R.sub.2 being hydrogen, alkyl, alkenyl, alkinyl, cycloalkyl, aryl, aralkyl or the nitrogen atom is part of a saturated ring which optionally contains further hetero-atoms, or the radical .sup.+NR.sub.3 R.sub.4 R.sub.5 with R.sub.3, R.sub.4 and R.sub.5 being hydrogen, alkyl, alkenyl, alkinyl, cycloalkyl, aryl, aralkyl or the nitrogen atom is part of a saturated or unsaturated ring which optionally contains further hetero-atoms, B is an ammonium or phosphonium radical and X.sup.- is an anion. The process is useful for crosslinking e.g. gelatine layers in photographic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.